In-vehicle silencing system and vehicle

Abstract

The present invention provides an in-car sound-absorbing system and a car, and relates to the field of car sound-absorbing. The in-car sound-absorbing system includes a main controller, a microphone, and a headrest sound-absorbing device arranged inside a headrest, wherein the main controller is electrically connected to the microphone; the microphone is used to collect noise at a human ear, and generate a noise signal to be sent to the main controller; the main controller generates and outputs a first sound-absorbing frequency signal according to the noise signal; the headrest sound-absorbing device generates a sound-absorbing frequency corresponding to the noise at the human ear according to the first sound-absorbing frequency signal. The sound-absorbing frequency can be adaptively adjusted according to the actual noise at the human ear, and the actual sound-absorbing and noise-reducing effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of automobile silencing, and in particular to an in-vehicle silencing system and a vehicle. Background Art

[0002] As a means of transportation for daily travel, cars will generate various noises into the car during driving. The noise inside the car is an important factor affecting the driving experience, and corresponding noise reduction technology is needed to eliminate the noise inside the car.

[0003] A silencing means of a resonant cavity has appeared in the prior art. The resonant cavity is also called a "Helmholtz resonant cavity", which specifically includes a silencing cavity, a volume adjusting member covering one end of the silencing cavity, and a connecting pipe connected to the other end of the silencing cavity. The silencing cavity is arranged as a cavity structure, and the volume adjusting member is movably connected in the cavity structure of the silencing cavity; the connecting pipe includes a first tube body, a second tube body and a telescopic tube body located between the first tube body and the second tube body, and the other end of the silencing cavity is detachably connected and connected to the first tube body, and the telescopic tube body is arranged to change the distance between the first tube body and the second tube body by its own telescopic expansion.

[0004] The existing resonant cavity changes the volume parameters of the silencing cavity within a certain range by moving the volume adjusting member, and changes the length of the entire connecting pipe by changing the length of the telescopic tube body, thereby meeting the needs of noise frequency modulation and adjustment.

[0005] However, in actual vehicle use, the noise inside the car is not fixed, but is closely related to the vehicle usage and the external environment. In addition, the distribution position of the silencer structure also determines the effect of silencer and noise reduction, and ultimately affects the actual experience of the driver and passengers.

[0006] In summary, the existing resonant cavity cannot generate corresponding sound-absorbing frequencies according to changes in vehicle usage and external environment. Moreover, the distribution position of the sound-absorbing structure is not directly designed for drivers and passengers, and the actual sound-absorbing and noise-reducing effect is poor. Summary of the invention

[0007] In order to solve the above problems, the purpose of the present invention is to provide an in-vehicle sound reduction system and a car, so as to solve the problem that the existing resonance cavity cannot generate corresponding sound reduction frequencies according to changes in vehicle usage and external environment, and the distribution position of the sound reduction structure is not directly designed for drivers and passengers, resulting in poor actual sound reduction and noise reduction effects.

[0008] The technical solution of the in-vehicle silencing system of the present invention is:

[0009] The in-vehicle silencing system includes a main controller, a microphone disposed on a headrest, and a headrest silencing device disposed inside the headrest, wherein the main controller is electrically connected to the microphone;

[0010] The microphone is used to collect noise at the human ear and generate a noise signal to be sent to the main controller; the main controller is used to receive the noise signal, generate and output a first noise cancellation frequency signal according to the noise signal;

[0011] The headrest silencer generates a silencer frequency corresponding to the noise at the human ear according to the first silencer frequency signal.

[0012] Further, the headrest silencer comprises a main shell, an air intake pipe and a driving mechanism, the air intake passage of the air intake pipe is communicated with the inner cavity of the main shell, an adjusting part is movably installed in the air intake pipe, and the driving mechanism is drivingly connected with the adjusting part to adjust the length of the air intake passage of the air intake pipe;

[0013] The driving mechanism is electrically connected to the main controller, and is used to receive the first sound-absorbing frequency signal and drive the adjustment unit to move and adjust the air intake channel of the air intake pipe to a corresponding length, so that the headrest silencer generates a sound-absorbing frequency corresponding to the noise at the human ear.

[0014] Furthermore, one end of the air inlet pipe is an air inlet end, and the outside of the air inlet end is covered with a perforated fabric.

[0015] Furthermore, the air intake pipe is fixedly connected to the main housing, a through groove is provided on the pipe wall of the air intake pipe, and the adjusting part is an adjusting inner pipe slidably installed in the air intake pipe;

[0016] The regulating inner tube is provided with a through hole corresponding to the through groove, and the regulating inner tube is connected between the air intake passage of the air intake pipe and the inner cavity of the main shell.

[0017] Furthermore, the regulating inner tube is provided with a blocking end away from the air inlet end, the driving mechanism is transmission-connected to the blocking end of the regulating inner tube, and the transmission direction of the driving mechanism is arranged along the length direction of the air inlet passage of the air inlet pipe.

[0018] Furthermore, the headrest is provided with a headrest bracket, the upper portion of the headrest bracket is bent to provide a supporting section, and the headrest muffler is fixedly mounted on the supporting section of the headrest bracket.

[0019] Furthermore, the main shell is in a rectangular shape, the air intake pipe is fixed to the lower part of the main shell, and the length direction of the air intake passage of the air intake pipe is arranged parallel to the length direction of the main shell.

[0020] Furthermore, it also includes a vehicle speed control module and an in-vehicle muffler, and the main controller is electrically connected to the vehicle speed control module;

[0021] The vehicle speed control module is used to detect the vehicle speed and send a vehicle speed signal to the main controller; the main controller is used to receive the vehicle speed signal, generate and output a second mute frequency signal according to the vehicle speed signal;

[0022] The structure of the in-vehicle silencer is the same as that of the headrest silencer, and the main controller is also electrically connected to the driving mechanism of the in-vehicle silencer so that the in-vehicle silencer generates a silencer frequency corresponding to the vehicle speed.

[0023] Furthermore, the in-vehicle silencer includes a glove box silencer installed in a glove box, and / or a coat rack silencer installed in a coat rack.

[0024] Furthermore, the vehicle speed control module is an automatic transmission control module.

[0025] The technical solution of the automobile of the present invention is:

[0026] The automobile includes an in-car silencing system, the in-car silencing system including a main controller, a microphone disposed on a headrest, and a headrest silencing device disposed inside the headrest, the main controller being electrically connected to the microphone;

[0027] The microphone is used to collect noise at the human ear and generate a noise signal to be sent to the main controller; the main controller is used to receive the noise signal, generate and output a first noise cancellation frequency signal according to the noise signal;

[0028] The headrest silencer generates a silencer frequency corresponding to the noise at the human ear according to the first silencer frequency signal.

[0029] Further, the headrest silencer comprises a main shell, an air intake pipe and a driving mechanism, the air intake passage of the air intake pipe is communicated with the inner cavity of the main shell, an adjusting part is movably installed in the air intake pipe, and the driving mechanism is drivingly connected with the adjusting part to adjust the length of the air intake passage of the air intake pipe;

[0030] The driving mechanism is electrically connected to the main controller, and is used to receive the first sound-absorbing frequency signal and drive the adjustment unit to move and adjust the air intake channel of the air intake pipe to a corresponding length, so that the headrest silencer generates a sound-absorbing frequency corresponding to the noise at the human ear.

[0031] Furthermore, one end of the air inlet pipe is an air inlet end, and the outside of the air inlet end is covered with a perforated fabric.

[0032] Furthermore, the air intake pipe is fixedly connected to the main housing, a through groove is provided on the pipe wall of the air intake pipe, and the adjusting part is an adjusting inner pipe slidably installed in the air intake pipe;

[0033] The regulating inner tube is provided with a through hole corresponding to the through groove, and the regulating inner tube is connected between the air intake passage of the air intake pipe and the inner cavity of the main shell.

[0034] Furthermore, the regulating inner tube is provided with a blocking end away from the air inlet end, the driving mechanism is transmission-connected to the blocking end of the regulating inner tube, and the transmission direction of the driving mechanism is arranged along the length direction of the air inlet passage of the air inlet pipe.

[0035] Furthermore, the headrest is provided with a headrest bracket, the upper portion of the headrest bracket is bent to provide a supporting section, and the headrest muffler is fixedly mounted on the supporting section of the headrest bracket.

[0036] Furthermore, the main shell is in a rectangular shape, the air intake pipe is fixed to the lower part of the main shell, and the length direction of the air intake passage of the air intake pipe is arranged parallel to the length direction of the main shell.

[0037] Furthermore, it also includes a vehicle speed control module and an in-vehicle muffler, and the main controller is electrically connected to the vehicle speed control module;

[0038] The vehicle speed control module is used to detect the vehicle speed and send a vehicle speed signal to the main controller; the main controller is used to receive the vehicle speed signal, generate and output a second mute frequency signal according to the vehicle speed signal;

[0039] The structure of the in-vehicle silencer is the same as that of the headrest silencer, and the main controller is also electrically connected to the driving mechanism of the in-vehicle silencer so that the in-vehicle silencer generates a silencer frequency corresponding to the vehicle speed.

[0040] Furthermore, the in-vehicle silencer includes a glove box silencer installed in a glove box, and / or a coat rack silencer installed in a coat rack.

[0041] Furthermore, the vehicle speed control module is an automatic transmission control module.

[0042] Beneficial effects: The in-vehicle silencer system adopts a structural design of a main controller, a microphone and a headrest silencer. The microphone on the headrest is used to collect noise at the human ear and generate a noise signal to send to the main controller; the main controller receives the noise signal sent by the microphone, generates and outputs a first silencer frequency signal according to the noise signal; the main controller controls the operation of a driving mechanism of the headrest silencer, and the driving mechanism drives the adjustment part to move its position according to the first silencer frequency signal, so that the air intake channel of the air intake pipe is adjusted to a corresponding length. After changing the length of the air intake channel of the air intake pipe, the entire headrest silencer can generate a silencer frequency corresponding to the noise at the human ear.

[0043] Since the muffler frequency of the headrest muffler changes in accordance with the first muffler frequency signal sent by the main controller, and the first muffler frequency signal is generated in accordance with the noise collected by the microphone at the human ear, the muffler effect can be achieved when the muffler frequency is consistent with the noise frequency. Therefore, the muffler frequency can be flexibly and adaptively adjusted according to the actual noise at the human ear. Compared with the existing resonant cavity, the in-vehicle muffler system can generate corresponding muffler frequencies according to changes in vehicle usage and external environment. Moreover, the headrest muffler is located in the headrest close to the human ear and is specially designed for the driver and passengers, so the actual muffler and noise reduction effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the circuit connection between the headrest silencer and the main controller in a specific embodiment of the in-vehicle silencer system of the present invention;

[0045] Figure 2 It is a three-dimensional schematic diagram of a headrest silencer installed on a headrest bracket in a specific embodiment of the in-vehicle silencer system of the present invention;

[0046] Figure 3 for Figure 2 A vertical cross-sectional view of the middle headrest silencer;

[0047] Figure 4 It is a circuit connection diagram of the glove box silencer and the main controller in a specific embodiment of the in-vehicle silencer system of the present invention;

[0048] Figure 5 A working principle diagram of the in-vehicle silencing system in a specific embodiment of the in-vehicle silencing system of the present invention;

[0049] Figure 6 It is a schematic diagram of the relationship between the sound absorption coefficient and frequency of perforated fabrics with different damping ratios in a specific embodiment of the in-vehicle sound reduction system of the present invention.

[0050] In the figure: 1-main controller, 11-microphone, 12-vehicle speed control module;

[0051] 2-headrest silencer, 20-main housing, 200-inner cavity of the main housing;

[0052] 21-intake pipe, 210-intake passage of the intake pipe, 211-intake end, 212-through groove;

[0053] 22-driving mechanism, 23-adjusting inner tube, 230-through hole, 231-blocking end;

[0054] 3-headrest, 31-headrest bracket, 32-supporting section of the headrest bracket, 4-glove box muffler. DETAILED DESCRIPTION

[0055] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0056] A specific embodiment 1 of the in-vehicle silencing system of the present invention is as follows: Figures 1 to 6 As shown, the in-vehicle silencer system includes a main controller 1, a microphone 11 arranged on the headrest 3, and a headrest silencer 2 arranged inside the headrest 3. The main controller 1 is electrically connected to the microphone 11; the microphone 11 is used to collect noise at the human ear and generate a noise signal to send to the main controller 1; the main controller 1 is used to receive the noise signal, generate and output a first silencer frequency signal according to the noise signal.

[0057] The headrest silencer 2 includes a main shell 20, an air intake pipe 21 and a driving mechanism 22. The air intake channel 210 of the air intake pipe is connected to the inner cavity 200 of the main shell. An adjusting part is movably installed in the air intake pipe 21. The driving mechanism 22 is transmission-connected with the adjusting part to adjust the length of the air intake channel 210 of the air intake pipe. The driving mechanism 22 is electrically connected to the main controller 1. The driving mechanism 22 is used to receive a first muffler frequency signal and drive the adjusting part to move and adjust the air intake channel 210 of the air intake pipe to a corresponding length, so that the headrest silencer 2 generates a muffler frequency corresponding to the noise at the human ear.

[0058] The in-vehicle silencer system adopts the structural design of the main controller 1, the microphone 11 and the headrest silencer 2. The microphone 11 on the headrest 3 collects the noise at the human ear and generates a noise signal to send to the main controller 1; the main controller 1 receives the noise signal sent by the microphone 11, generates and outputs a first silencer frequency signal according to the noise signal; the main controller 1 controls the driving mechanism 22 of the headrest silencer 2 to work, and the driving mechanism 22 drives the adjustment part to move the position according to the first silencer frequency signal, so that the air intake channel 210 of the air intake pipe is adjusted to the corresponding length. After changing the length of the air intake channel 210 of the air intake pipe, the entire headrest silencer 2 can generate a silencer frequency corresponding to the noise at the human ear. In other embodiments, the headrest silencer can also be configured such that the driving mechanism drives the adjustment part to move the position according to the first silencer frequency signal, changes the volume of the cavity (equivalent to the inner cavity of the main shell) of the Helmholtz resonance cavity, and enables the entire headrest silencer to generate a silencer frequency corresponding to the noise at the human ear.

[0059] Since the sound-absorbing frequency of the headrest silencer 2 changes in accordance with the first sound-absorbing frequency signal sent by the main controller 1, and the first sound-absorbing frequency signal is generated in accordance with the noise collected by the microphone 11 at the human ear, the sound-absorbing effect can be achieved when the sound-absorbing frequency is consistent with the noise frequency. Therefore, the sound-absorbing frequency can be flexibly and adaptively adjusted according to the actual noise at the human ear. Compared with the existing resonant cavity, the in-vehicle sound-absorbing system can generate corresponding sound-absorbing frequencies according to changes in vehicle usage and external environment. Moreover, the headrest silencer 2 is located in the headrest 3 close to the human ear, and is specially designed for the driver and passengers, and the actual sound-absorbing and noise-reducing effect is better.

[0060] In this embodiment, one end of the air inlet pipe 21 is an air inlet end 211, and the air inlet end 211 is covered with a perforated fabric. The perforated fabric is used to increase the damping ratio of the muffler. The damping ratio is related to the diameter of the perforation. The smaller the perforation diameter, the greater the damping ratio. Figure 6 As shown in the figure, through simulation tests, it is found that the damping ratios are arranged in order from small to large in scheme ①, scheme ②, scheme ③, and scheme ④. By comparing the sound absorption coefficient, it can be found that the greater the damping, the higher the sound absorption coefficient, but there is an optimal damping to maximize the sound absorption coefficient of the muffler. In addition, the volume of the inner cavity 200 of the main shell of the muffler is related to the silencing frequency bandwidth. The larger the volume of the inner cavity 200 of the main shell, the wider the silencing bandwidth, and the better the sound absorption effect.

[0061] The air intake pipe 21 is fixedly connected to the main housing 20, and a through slot 212 is provided on the pipe wall of the air intake pipe 21. The adjusting part is an adjusting inner pipe 23 slidably installed in the air intake pipe 21; the adjusting inner pipe 23 is provided with a through hole 230 corresponding to the through slot 212, and the adjusting inner pipe 23 is connected between the air intake channel 210 of the air intake pipe and the inner cavity 200 of the main housing. The air intake end 211 of the air intake pipe 21, the air intake channel 210 of the air intake pipe, the inner channel of the adjusting inner pipe 23 and the through hole 230 finally form a complete resonant cavity structure of the headrest muffler 2 with the inner cavity 200 of the main housing.

[0062] In addition, the regulating inner tube 23 is provided with a blocking end 231 away from the air inlet end 211, the driving mechanism 22 is in transmission connection with the blocking end 231 of the regulating inner tube 23, and the transmission direction of the driving mechanism 22 is arranged along the length direction of the air inlet passage 210 of the air inlet pipe. Specifically, the regulating inner tube 23 is in sliding sealing cooperation with the inner tube wall of the air inlet pipe 21, a transmission rod is connected between the blocking end 231 of the regulating inner tube 23 and the driving mechanism 22, and the driving mechanism 22 is a linear motion motor, which can accurately drive the regulating inner tube 23 to move in the air inlet passage 210 of the air inlet pipe.

[0063] The position of the inner tube 23 is controlled and adjusted according to the first muffler frequency signal to change the length of the entire air intake passage, thereby adjusting the muffler frequency of the headrest muffler 2. The working principle is as follows:

[0064] The sound elimination frequency of the Helmholtz cavity is:

[0065]

[0066] Wherein, c is the speed of sound, A is the cross-sectional area of ​​the pipe of the Helmholtz resonant cavity (equivalent to the intake passage 210 of the intake pipe), V is the volume of the cavity of the Helmholtz resonant cavity (equivalent to the inner cavity 200 of the main shell), and L is the length of the pipe of the Helmholtz resonant cavity (equivalent to the intake passage 210 of the intake pipe).

[0067] According to the above formula, the sound elimination frequency can be changed by only adjusting the length L of the pipe of the Helmholtz resonant cavity (equivalent to the intake channel 210 of the intake pipe).

[0068] In addition, the headrest 3 is provided with a headrest bracket 31, and the upper part of the headrest bracket 31 is bent to provide a supporting section 32, and the headrest muffler 2 is fixedly mounted on the supporting section 32 of the headrest bracket 31. The supporting section 32 is designed at the upper part of the headrest bracket 31, so that the headrest muffler 2 can be better fixedly mounted. The main shell 20 is in the shape of a rectangular parallelepiped, the air intake pipe 21 is fixed at the lower part of the main shell 20, and the length direction of the air intake channel 210 of the air intake pipe is arranged parallel to the length direction of the main shell 20, so that the internal space of the headrest 3 is utilized to achieve a reasonable layout and arrangement.

[0069] In this embodiment, the in-vehicle silencer system also includes a vehicle speed control module 12 and an in-vehicle silencer, and the main controller 1 is electrically connected to the vehicle speed control module 12; the vehicle speed control module 12 is used to detect the vehicle speed and send a vehicle speed signal to the main controller 1; the main controller 1 is used to receive the vehicle speed signal, generate and output a second silencer frequency signal according to the vehicle speed signal; the structure of the in-vehicle silencer is the same as that of the headrest silencer 2, and the main controller 1 is also electrically connected to the driving mechanism of the in-vehicle silencer so that the in-vehicle silencer generates a silencer frequency corresponding to the vehicle speed.

[0070] Specifically, the in-vehicle silencer includes a glove box silencer 4 installed in the glove box, and a coat rack silencer installed in the coat rack. The vehicle speed control module 12 is an automatic transmission control module (hereinafter referred to as "TCU"), which detects and sends a vehicle speed signal using the TCU. The main controller 1 determines whether the current vehicle speed is lower than or higher than 50Kph, which corresponds to the main noise frequency of the in-vehicle sound cavity, based on the vehicle speed signal, and then generates and outputs a second mute frequency signal. The corresponding driving mechanism works to change the length of the air intake channel of the air intake pipe, thereby adjusting the mute frequency of the glove box silencer 4 and the coat rack silencer, and the mute frequency of the two is consistent with the main noise frequency of the in-vehicle sound cavity at the corresponding vehicle speed.

[0071] A specific embodiment of the automobile of the present invention comprises an in-vehicle sound-absorbing system. The in-vehicle sound-absorbing system is a specific embodiment of the in-vehicle sound-absorbing system of the present invention. The specific embodiments of the in-vehicle sound-absorbing system are the same and will not be described in detail herein.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A vehicle interior silencing system, characterized in that: It includes a main controller, a microphone arranged on the headrest, and a headrest muffler arranged inside the headrest, wherein the main controller is electrically connected to the microphone; The microphone is used to collect noise at the human ear and generate a noise signal to be sent to the main controller; The main controller is used to receive the noise signal, generate and output a first audio cancellation frequency signal according to the noise signal; The headrest silencer generates a silencer frequency corresponding to the noise at the human ear according to the first silencer frequency signal; The headrest silencer comprises a main shell, an air intake pipe and a driving mechanism, the air intake passage of the air intake pipe is communicated with the inner cavity of the main shell, an adjusting part is movably installed in the air intake pipe, and the driving mechanism is drivingly connected with the adjusting part to adjust the length of the air intake passage of the air intake pipe; The air intake pipe is fixedly connected to the main housing, a through groove is provided on the pipe wall of the air intake pipe, and the adjusting part is an adjusting inner pipe slidably installed in the air intake pipe; The regulating inner tube is provided with a through hole corresponding to the through groove, and the regulating inner tube is connected between the air intake passage of the air intake pipe and the inner cavity of the main shell; One end of the air inlet pipe is an air inlet end, and one end of the regulating inner tube away from the air inlet end is provided with a blocking end.

2. The in-vehicle sound-absorbing system according to claim 1, characterized in that: The driving mechanism is electrically connected to the main controller, and is used to receive the first sound-absorbing frequency signal and drive the adjustment unit to move and adjust the air intake channel of the air intake pipe to a corresponding length, so that the headrest silencer generates a sound-absorbing frequency corresponding to the noise at the human ear.

3. The in-vehicle sound-absorbing system according to claim 2, characterized in that: The outside of the air inlet end is covered with perforated fabric.

4. The in-vehicle sound-absorbing system according to claim 1, characterized in that: The driving mechanism is drivingly connected to the blocking end of the regulating inner tube, and the driving direction of the driving mechanism is arranged along the length direction of the air intake passage of the air intake pipe.

5. The in-vehicle sound-absorbing system according to any one of claims 1 to 4, characterized in that: The headrest is provided with a headrest bracket, the upper part of the headrest bracket is bent to provide a supporting section, and the headrest muffler is fixedly mounted on the supporting section of the headrest bracket.

6. The in-vehicle sound-absorbing system according to any one of claims 2 to 4, characterized in that: The main housing is in a rectangular parallelepiped shape, the air intake pipe is fixed to the lower portion of the main housing, and the length direction of the air intake passage of the air intake pipe is arranged parallel to the length direction of the main housing.

7. The in-vehicle sound-absorbing system according to any one of claims 1 to 4, characterized in that: It also includes a vehicle speed control module and an in-vehicle muffler, and the main controller is electrically connected to the vehicle speed control module; The vehicle speed control module is used to detect the vehicle speed and send a vehicle speed signal to the main controller; the main controller is used to receive the vehicle speed signal, generate and output a second mute frequency signal according to the vehicle speed signal; The structure of the in-vehicle silencer is the same as that of the headrest silencer, and the main controller is also electrically connected to the driving mechanism of the in-vehicle silencer so that the in-vehicle silencer generates a silencer frequency corresponding to the vehicle speed.

8. The in-vehicle sound-absorbing system according to claim 7, characterized in that: The in-vehicle silencer includes a glove box silencer installed in a glove box and / or a coat rack silencer installed in a coat rack.

9. The in-vehicle sound-absorbing system according to claim 7, characterized in that: The vehicle speed control module is an automatic transmission control module.

10. A car, characterized in that: It comprises an in-vehicle sound reduction system, wherein the in-vehicle sound reduction system is the in-vehicle sound reduction system according to any one of claims 1 to 9.

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